what kind of needle for Brother db2-b755-3 sewing machine? what does size 14/90 means?

The size indicates the size of the tip of the needle, that goes through the fabric. All sewing machines needles should fit in all modern sewing machines. The size that you want depends on what kind of fabric you want to sew. Lower numbers are smaller tips and better for lighter-weight fabrics; bigger numbers are wider tipped needles and better for heavier fabrics. 14/90 is about in the middle, good for medium-weight fabrics. There are two numbers because one is the American size (14) and the other is the European, metric size (90). If you do a google search for "sewing machine needle size" there is a helpful chart from Joann's fabric store that comes up as one of the first results, and can help you pick the right needle for your project.

what size needles are included in this combo pack?

70/10 80/12 80/13 90/14 75/11 90/14 90/14 100/16 130/705H

Is the twin needle stretch?

You can get the needles for stretch fabrics. This package has one stretch two universal and one for heavy fabrics like jeans. A good choice for variety of jobs.

Compatible Material	Jeans/Denim, Jersey/Ball Point, Microtex, Universal 12/80
Point Type	Chisel Point
Compatible Devices	Domestic Sewing Machine

Sewing Machine Needles - Combo Pack

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